Image recording method and ink jet ink composition

Abstract

An image recording method according to this invention is an image recording method using an ink jet ink composition containing a pigment, in which the maximum particle size of the pigment is 2.5 μm or less and recording is performed with continuous scanning time of 10 minutes or more.

Description

BACKGROUND1. Technical Field[0001]The present invention relates to an image recording method and an ink jet ink composition.2. Related Art[0002]In recent years, a recording method of an ink jet system uses an ink jet composition (hereinafter also referred to as “ink”) containing a pigment as a coloring material in order to form an image having high water resistance, solvent resistance, abrasion resistance, and the like on the surface of a recording medium and, particularly, a radiation curing type ink jet ink composition which is cured when radiation is emitted as an ink in order to record an image having higher water resistance and the like. In general, the radiation curing type ink jet ink composition contains a polymerizable compound, such as a monofunctional monomer and a polyfunctional monomer, a photopolymerization initiator, a pigment, and the like.[0003]In an image recording method using such a pigment ink, an ink jet recording apparatus having a line head as a recording hea...

AI Technical Summary

Benefits of technology

The patent text discusses the use of specific compounds, such as acylphosphine oxide compounds and thioxanthone compounds, as photopolymerization initiators in ink jet compositions. These compounds have good solubility and can improve the curability of the ink. The use of multiple photopolymerization initiators can also be combined to achieve better results. The content of the photopolymerization initiator should be between 0.5% and 15% by mass based on the total mass of the ink composition. When the content is too low, the ultraviolet curing rate may not be sufficient, and when the content is too high, coloring may occur. The combination of acylphosphine oxide compounds and thioxanthone compounds as photopolymerization initiators can provide optimal results.

Problems solved by technology

However, also in the recording method, when the continuous printing is performed over a long period of time (for example, 10 minutes or more), poor discharge sometimes occurs.

It has been clarified that, particularly in high-speed continuous printing using an ink containing a specific pigment (for example, specific yellow pigment), particularly poor discharge is likely to occur due to clogging of a nozzle resulting from the accumulation of coarse particles, the occurrence of cavitation in a head, and the like.

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